Side brush



FIG. 1 is a front elevation view of a side brush showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is an overhead perspective view thereof; and,

FIG. 7 is a bottom perspective view thereof.

CLAIM The ornamental design for a side brush, as shown and described.